Disclaimer: Following post lists load data not currently published by powder manufacturer. Use them at your own risk.
maxxhavoc, yes as rcmodel posted, Alliant/ATK pulled the older 2004 load data from their servers and there is no currently published Red Dot load data for 9mm (only for 38/38Spl/45ACP/45Colt etc.) -
http://www.alliantpowder.com/reloaders/Powder.aspx?powderid=4
2004 Alliant load data did list loads for 9mm lead/jacketed bullets and that pdf is available here -
http://www.thehighroad.org/attachment.php?attachmentid=182147&d=1364769070
scythefwd, as mstreddy mentioned, I did 9mm/40S&W testing of Promo using 2004 Alliant load data for Red Dot on this thread -
http://www.thehighroad.org/showthread.php?t=518185
On that thread, 9mm Missouri lead 125 gr RN and Berry's plated 124 gr RN bullets were tested with 3.8/4.0/4.2 gr of Promo with good results and based on that testing, 4.0 gr of Promo/Red Dot and 124/125 gr lead RN bullet is my current reference 9mm plinking load.
2004 Alliant load data lists 4.5 gr as max charge for 115 gr FMJ at 1.120" OAL and 4.6 gr max charge for 125 gr FMJ at 1.150" OAL and 4.5 gr for 125 gr lead bullet at same OAL. I use Berry's 115/124 gr solid/HB plated RN bullets and use 1.135" OAL to feed reliably in various pistols.
For your Berry's 115 gr plated RN load, I would suggest using 1.135" OAL and 4.0 gr of Red Dot as start charge and testing 4.2/4.4 gr and see how things go. Unlike thicker plated (TP) HB bullets, my experience with Berry's regular plated solid base bullets has been that often accuracy starts to fall at higher than mid range jacketed load data.